Coal-dust furnace



J.- TAYLOR.

COAL DUST FURNACE.

APPLICATION FILED JLTNE e. 1919.

Patented Apr. 5, 1921'.

2 SHEETSSH EET 1.

I INVENTOR ATTORNEY J. TAYLOR.

C'OAL DUST FURNACE- APPLICATION FILED JUNE 6. 1919.

L573,;"?76 Patented Apr.5,1921.

2 SHEETS-SHEET 2.

INVENTdR ATTORNEY JOHN TA-YIiOR, OF SALT LAKE CITY, UTAH.

' COAL-DUST FURNACE.

To all whom it may concern Be it known that I, J OHN TAYLoR, a citizenof the United States of America, residing at Salt Lake City, in thecounty of Salt Lake and State-of Utah, have invented certain new anduseful Improvements in Coal-Dust Furnaces, of which the following is aspecification.

This invention relates to coal dust furnaces adapted to burn fine fuelin suspension and it has for its object the provision of improved meansfor bringing about an intimate mixing of the fine fuel, such. as coaldust with the necessary amount of air to produce substantially perfectcombus-.

tion, together with a combustion chamber of such shape and designed insuch manner as to secure a highly efiicient burning of the fuel.

Another object of the invention is to rovide an improved feeding meansfor 4 eeding powdered coal dust or the like to a combustion chamberwherein means are provided for permitting the passage of largerparticles of the fuel past a fan without hitting the blades thereof.

It is intended that the air and coal dust discharged into the combustionchamber shall be ignited by the heat existing therein and by theincandescent condition of bricks constituting the walls thereof.

Further objects and advantages of the invention will be set forth in thedetailed description which now follows. 7

In the accompanying drawings 1 Figure 1 is a sectional view through thecombustion chamber upon line 11 of Fig. 4, showing a stove or range towhich the same is applied, in endelevation;

Fig.2 is a side view of the blowing or feeding apparatus;

Flg. 3 is a sectional view upon line 33 of Fig. 2;

Fig. 4 is a horizontal sectional view through the combustion chamberupon line H of Fig. 1';

Fig. 5 is a vertical sectional view upon line 5-5 of Fig. 1;

Fig. 6 is a plan view of the feeding apparatus; and

Fig. 7 is a side.elevation of the feeding ap aratus with one of theplates removed.

ike numerals designate corresponding parts in all of the figures of thedrawings.

Specification of Letters Patent.

'18, 18 and 18".

Patented Apr. 5-, 1921.

Application filed June 6, 1919. Serial No. 302,330.

formed of fire brick 7. The combustionchamber is preferablywater-jacketed as indicated at 8. A port 9 leads through the rear wallof the combustion chamber and communicates with a flue 9, through whichthe products of combustion from the 60mbust1on chamber are dischargedinto and through the. stove indicated at 10. 11 designates an oil tankfrom which oil may be fed through a pipe 12 to the interior of thecombustion chamber for initially setting the device in operation. Thelower part of the v flue 9 is provided with a plug-like closure 13 thatis carried by a counter weighted lever 14, the latter being pivoted at15 and this structure provides means for cleaning out the ashes andclinker that may be pushed from the combustion chamber into the flue 9.

After the combustion chamber has been initiallyheated by oil introducedthrough the pipe- 12 combustion therein is afterward maintained by asupply of air and fine fuel, such as coal dust, fed into the combustionchamber tangentially through apipe 16. This pipe is preferablywaterjacketed as indicated at 17, both the waterjackets receiving theirsupply through ipes An outlet pipe 18 eads from water jacket 8.

19' designates a coal bin adapted to receive coal dust or other powderedor fine fuel. A slidable gate 20 is movable upon a pipe 21 whichprojects into the coal bin and has an opening 22 formed in its side. The

- gate 20 is movable with respect to thisopening in such manner as tocontrol the amount of fuel passing therethrough. A worm con- Veyer 23 isdisposed within the pipe 21 and feeds the fuel longitudinallytherethrough and discharges the fuel through a nozzle'or spout 24 into afan casing 25. The air inlet opening-for supplying air to the fan isindicated at 21*. The worm 23 receives its motion from a shaft 26 thatis driven from a motor 27 by means of pulleys 28 and 29, belt 30, shaft31, worm 32, and worm gear 33 the latterbeing fast upon the shaft 26.The pulley 28 is mounted upon the shaft 3 1 of the motor and this shaftlikewise carries the fan 35 that is disposed within the fan casing 25. Adischarge pipe 36 leading from this fan casing forms an extension of thepipe 16.

A funnel like member 37 is carried by a pipe 38 which projects at anangle from the pipe 36 in such manner as to cause air to be drawnthereinto by the force of the blast through the pipe 36. By the planview of Fig. 6 it will-be seen that the fan casing is provided with alateral extension 39 in which a channel is formed that lies in alinementwith the nozzle 24,and to one side of the fan 35 which permits thelarger particles of the fuel to pass the fan without actually contactingwith the fan blades. A washer 40 upon the shaft of the fan acts asa'baflie to prevent the fuel from coming in direct contact with the fan.

It is to be noted that when the fuel first enters the combustion chamberit enters at the forward part of said combustion chamber and isdischarged into a lateral extension 41 of said combustion chamber whichrenders said combustion chamber of larger diameter at the forwardportion thereof than at the rear portion thereof. The result is that awhirling in a spiral path is set up, and the intimately mixed coal dustand air are brought into contact with heat and light radiated from theincandescent Walls of the combustion chamber and are ignited and burnedAs the coal dust is heavier than air most of it would crowd against thelower side of pipe 16. To prevent such action I have placed a dent 16 inpipe 16 near its mouth, thus throwing the coal dust in the directionindicated by dots Fig. 1, the air going in the course indicated byarrows as but little of it would strike this dent.

The coal dust being heavier it would not turn and run tangent so quicklyas the air but continues straight up and crosses into the path of heatedair nearer the center of combustion chamber where it ignites.

The structure herein shown and described a substantially circularcombustion cham ber the axis of which is horizontally disposed, aconductor for the products of combustion leading from the rear of saidchamber and materially smaller in diameter than said combustion chamber,a flue disposed at right angles to said conduit and a pipe adapted tocarry air and powdered fuel, said pipe leading through the side wall ofthe combustion chamber adjacent the front Tend thereof and dischargingtangentially thereinto.

2. In a device of the character described a substantially circularcombustion chamber, the axis of which is horizontally disposed, aconduit for the products of combustion leading from the rear of saidchamber and materially smaller in diameter than said combustion chamber,a flue disposed at right angles to said conduit a pipe of such size asto carry air and powdered fuel leading through the side walls of thecombustion chamber adjacent the front end thereof and dischargingtangentially thereinto, and a raised element in said pipe adjacent itspoint of discharge and disposed at the bottom thereof to deflect theheavier part of the current upwardly at the moment of discharge.

In testimony whereof I aflix my signature in the presence of twowitnesses.

JOHN TAYLOR. Witnesses:

ROBERT L. J UDD, I. M. FYFE.

